Online PHP editor | refs for qTioM

<?php function f($propertyName): string { $lcPropertyName = lcfirst($propertyName); $snakeCasedName = ''; $len = strlen($lcPropertyName); for ($i = 0; $i < $len; ++$i) { if (ctype_upper($propertyName[$i])) { $snakeCasedName .= '_'.strtolower($propertyName[$i]); } else { $snakeCasedName .= strtolower($propertyName[$i]); } } return $snakeCasedName; } echo f('ThisIsATest').PHP_EOL; echo f('thisIsATest');